add resources

Author: osamaakb

module3-crud-and-data-models/r1-schema-and-data-models/README.md

@@ -41,8 +41,6 @@ CREATE TABLE customer (
 
 We can see that the schema definition for the `Customer` has a `name` which is a type `string` and a `zipcode` that is of type `number`.
 
-For more details about database schemas [see this](https://www.educative.io/blog/what-are-database-schemas-examples#types)
-
 ### The Difference between data model and schema
 
 The database schema is one that contains list of attributes and instructions to tell the database engine how data is organised whereas Data model is a collection of conceptional tools for describing data, data-relationship and consistency constraints.
@@ -157,4 +155,7 @@ Response: Status Code - 204 (NO CONTENT)
 
 Body - None
 
-[See this](https://www.educative.io/blog/crud-operations#what) for more information on how these operations are performed on `SQL` database.
+## Resources
+
+- [See this](https://www.educative.io/blog/crud-operations#what) for more information on how these operations are performed on `SQL` database.
+- [database schemas](https://www.educative.io/blog/what-are-database-schemas-examples#types)

module3-crud-and-data-models/r1.1-principles-of-setting-up-your-schema/README.md

@@ -45,4 +45,6 @@ In general, there are few `rules` you can follow to better design your schema:
 3. Avoid JOINs and $lookups if they can be avoided, but don't be afraid if they can provide a better schema design.
 4. How you model your data depends _entirely_ on your particular application's data access patterns.
 
-Watch [this video](https://www.youtube.com/watch?v=leNCfU5SYR8) for a detailed explanation about schema design best practices.
+## Resources
+
+- [schema design best practices](https://www.youtube.com/watch?v=leNCfU5SYR8)

module3-crud-and-data-models/r3-model-view-controller/README.md

@@ -77,3 +77,7 @@ router.get('/posts', (req, res) => {
 ### Views
 
 In a back-end application, views are usually not implemented and rather we create a front-end app using maybe `React` to call our `api` end-points to manipulate the data in the back-end.
+
+## Resources
+
+- [MVC Architecture with NodeJS and mongoose](https://medium.com/geekculture/mvc-architecture-with-express-server-e35aedfe7889)

module3-crud-and-data-models/r3.2-models-and-controllers-in-mongoose/README.md

@@ -37,8 +37,6 @@ To get all the foods from our MongoDB using mongoose we can simply use the `find
 
 Note: we can read specific items from MongoDB using queries in the `find()` function.
 
-[Read here](https://mongoosejs.com/docs/models.html#Querying) for more information.
-
 Example:
 
 ```js
@@ -112,3 +110,7 @@ app.delete("/food/:id", async (request, response) => {
 
 // ...
 ```
+
+## Resources
+
+- [CRUD operations in mongoose](https://mongoosejs.com/docs/models.html#Querying)

module3-crud-and-data-models/r4-building-custom-methods-on-mongoose/README.md

@@ -24,3 +24,7 @@ dog.findSimilarTypes((err, dogs) => {
   console.log(dogs); // woof
 });
 ```
+
+## Resources
+
+- [instance methods in mongoose][https://mongoosejs.com/docs/guide.html#methods]